Track Interval Session Library Named Sessions by Energy System, Distance, and Level

This library indexes 21 named track sessions by energy system (alactic/speed, lactic/speed-endurance, aerobic/threshold), distance focus (800m-1600m vs. 1600m-3200m vs. 5K/10K), and experience level, so you can find the exact session you need instead of scrolling another generic "top workouts" list. Below: three browse tables covering alactic/speed, lactic/speed-endurance, and aerobic/threshold sessions, how the tagging system works, and guidance on matching sessions to your training phase and experience level — jump straight to the one you need:

Browse: Alactic/Speed Sessions
Browse: Lactic/Speed-Endurance Sessions
Browse: Aerobic/Threshold Sessions

Every session in this library is one I've actually prescribed to BRT athletes across 800m-3200m — this isn't a scrape of other sites' workout lists, and it's built to survive being bookmarked rather than read once and forgotten. Search "track workouts" and you'll get the same nine sessions rehashed with no context for who they suit or when to run them; that's the gap this page exists to close.

Why a True Session Library Doesn't Exist Elsewhere Online

Most track workout content online is a single "top 5" or "top 9" article — a static list that goes stale, mixes energy systems together, and can't be filtered by your level or your race distance. This page works differently: it's an index you can come back to, organised so you can find sessions by what they train and who they suit, rather than by whichever nine sessions a writer happened to think of that week.

That distinction matters more than it sounds. A "top workouts" list treats a 60m sprint drill and a 3x2000m threshold session as interchangeable entries on the same page, when they train completely different systems and suit completely different runners. A library lets you search by what you actually need — build my closing speed, sharpen my lactate tolerance, or extend my aerobic ceiling — rather than by whatever ranking a writer decided on.

How This Library Is Organised — Energy System and Distance Tags

Every session here carries three tags. Understanding what they mean makes the tables below far more useful.

Alactic/Speed — reps of 0-80m, run at near-maximal effort with full recovery, each rep under 15 seconds. This trains raw speed off the phosphocreatine system, which supplies most of the energy for the first 10 seconds or so — the shorter reps here stay almost entirely in that window, though the longer ones edge into glycolysis (the lactic system) too.

Lactic/Speed-Endurance — reps of 150-600m, run at 800-1600m race effort with incomplete recovery. This is where you build tolerance to the burn of lactate accumulation.

Aerobic/Threshold — reps of 800-2000m, run at 5K-to-threshold effort. This builds the aerobic engine that underpins everything faster.

Distance-focus tags sit alongside these: Middle-Distance (800m-3200m) or Distance (5K-10K). Level tags — Developing, Competitive, Advanced — are explained in full further down the page.

None of these tags are exclusive to one runner type — a 10K racer will still do alactic strides in season, and an 800m runner will still build aerobic mileage over winter. What the tags tell you is the primary training effect of a given session, not the only runners allowed to do it. Use them as a starting filter, then adjust based on where you are in your own training cycle.

Browse: Alactic/Speed Sessions

10x60m flying sprints — build to speed over a 20m run-in, then hold near-max effort for 60m. Full recovery (2-3 minutes) between reps. This is pure speed development, no fatigue involved, and it's the one session on this table suitable for every level.

8x150m acceleration build-ups — run each rep progressively faster, easing into top speed by the final 50m rather than sprinting from the gun. This teaches relaxed mechanics at speed, which is exactly what developing runners tend to lack.

Ins-and-outs (4x120m fast-float-fast) — 40m fast, 40m float (relaxed but still quick), 40m fast again. It trains the ability to change gear smoothly, a skill that shows up directly in race-day surges.

Browse: Lactic/Speed-Endurance Sessions

A word of caution on the two hardest sessions here — the Australian pyramid and the descending ladder get prescribed far too early to runners who haven't built an aerobic base. I've seen it happen the same way each time: the runner nails the opening reps, then the wheels come off on the back half. By the last 200m of the pyramid they're 15 or more seconds off the pace they held at the start, and the session that was meant to build lactate tolerance instead teaches their body to shut down under fatigue. Both sessions belong to Advanced-level athletes with a genuine aerobic foundation underneath them — not a runner chasing a session name they found online.

If you're not sure how these paces translate to your own times, use our guide on calculating interval paces from your race time before attempting any of the sessions above.

Browse: Aerobic/Threshold Sessions

These sessions build the aerobic engine underneath everything faster you do on the track — mileage and easy running are the base, but sessions like Yasso 800s and threshold intervals are where that base translates into race fitness.

Filtering by Experience Level

The level tags aren't arbitrary — here's what they mean in practice:

Developing — under two years of structured track training, or fewer than two quality sessions a week currently.

Competitive — a regular racer, running two to three quality sessions a week as standard.

Advanced — three-plus years of structured training, comfortable handling back-to-back hard days without breaking down.

I coached a masters runner a few seasons back who'd picked an Advanced-tagged session off a generic training site — no level guidance attached, just a name and a rep scheme. It wrecked her. Ten days to recover from a single descending-ladder session, when a Competitive-level alternative with longer recoveries and fewer reps would have delivered nearly the same stimulus without the fallout. Match the level tag to where you actually are, not where you'd like to be.

Be honest about which category you fall into — most self-coached runners overestimate their level by one tier, usually because they're judging themselves against a single strong session rather than their consistency across a full training block. If you're unsure, start with the Developing or Competitive version of a session and build up from there. Dropping down a level costs you nothing; a wrecked hamstring from a session you weren't ready for costs you weeks.

Which Session to Pick When You're Not Sure of Your Phase

Not sure which table to start from? A simple rule: early season or base phase — start from the aerobic/threshold table. Six to eight weeks from your goal race — move into the lactic/speed-endurance table. Final three weeks before racing — shift to the alactic/speed table and lower your overall volume. For the full framework on how these phases fit together across a training week, see combining track sessions into a weekly plan.

Related Reading: Using This Library

Not sure what pace to run these sessions at? Start with calculating your own interval paces from a recent race time. If you're worried about repeating the same session too often, read rotating track sessions without losing the training stimulus. To build a full week around these sessions rather than picking them one at a time, see combining track sessions into a weekly plan. And if you're choosing between middle-distance and 5K/10K session types specifically, our comparison of 800m-3200m vs. 5K/10K track sessions breaks down exactly how they differ.

Frequently Asked Questions

Can I run these sessions on grass or road if I don't have track access?

Most of them, yes. Alactic and lactic sessions transfer well to a flat grass loop or a quiet stretch of road — just measure distances with a GPS watch rather than assuming your pacing feels right. Aerobic/threshold sessions transfer even more easily since even effort matters more than exact splits.

How often does this library get updated?

We add sessions as they prove themselves with BRT athletes, rather than on a fixed schedule. Check back each training block rather than each week.

What's the difference between a ladder and a pyramid workout?

A ladder moves in one direction — reps get consistently shorter (or longer) through the session. A pyramid goes up and back down, like 200-400-600-800-600-400-200, so you hit the longest rep in the middle and mirror the build on the way out.

Can I suggest a session to be added to this library?

Yes — if you've got a named session that's worked for you and fits one of the three categories above, get in touch through the contact page and we'll consider it for the next update.

All the best,
Dom